arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.07929hep-ph
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对μ子和电子$g-2$异常和暗物质的解释

An explanation for the muon and electron $g-2$ anomalies and dark matter

Kai-Feng Chen, Cheng-Wei Chiang, Kei Yagyu

摘要:

我们提出了一个简单的模型与风味相关的全球$U(1)_\ell$和离散的$\mathbb{Z}_2$对称性来解释测量的μ子和电子,$(g-2)_{μ,e}$的异常磁偶极矩的异常,同时容纳一个暗物质的候选人。引入这些新的对称性不仅是为了避免带电轻子的危险轻子味破坏衰变,而且也是为了确保暗物质的稳定性。我们的模型可以通过包含新的矢量轻子的单圈图实现对μ子和电子$g-2$的反号贡献。在真空稳定性和微扰么正性的约束下,在暗物质直接搜索和相关LHC数据的约束下,我们找到了合适的参数空间来同时解释$(g-2)_{μ,e}$和遗迹密度。在这个参数空间中,希格斯玻色子与μ子的耦合可以从其标准模型值增强高达$\sim 38\%$,这可以在未来的对撞机实验中进行测试。

英文摘要:

We propose simple models with a flavor-dependent global $U(1)_\ell$ and a discrete $\mathbb{Z}_2$ symmetries to explain the anomalies in the measured anomalous magnetic dipole moments of muon and electron, $(g-2)_{μ,e}$, while simultaneously accommodating a dark matter candidate. These new symmetries are introduced not only to avoid the dangerous lepton flavor-violating decays of charged leptons, but also to ensure the stability of the dark matter. Our models can realize the opposite-sign contributions to the muon and electron $g-2$ via one-loop diagrams involving new vector-like leptons. Under the vacuum stability and perturbative unitarity bounds as well as the constraints from the dark matter direct searches and related LHC data, we find suitable parameter space to simultaneously explain $(g-2)_{μ,e}$ and the relic density. In this parameter space, the coupling of the Higgs boson with muons can be enhanced by up to $\sim 38\%$ from its Standard Model value, which can be tested in future collider experiments.

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